Patents by Inventor Paul S. Liu

Paul S. Liu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10464881
    Abstract: Disclosed is a process for preparing (Z)-endoxifen, comprising (i) recrystallizing an input crystalline solid comprising a mixture of (Z)-endoxifen (1) and (E)-endoxifen (2) from a first solvent to provide a first crystalline solid and a first mother liquor, wherein the first mother liquor has a ratio of (1) to (2) at least 1.3 times greater than the ratio in the input crystalline solid (1) and (2); (ii) recrystallizing a solid produced by concentrating the first mother liquor, or by removal of the first solvent from the first mother liquor, from a second solvent to give a second crystalline solid and a second mother liquor; (iii) optionally recrystallizing the second crystalline solid from the second solvent one to five additional times to give a third crystalline solid; wherein the third crystalline solid has a ratio of (Z)-endoxifen (1) to (E)-endoxifen (2) greater than 20:1.
    Type: Grant
    Filed: October 24, 2016
    Date of Patent: November 5, 2019
    Assignees: THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY, DEPARTMENT OF HEALTH AND HUMAN SERVICES, ALCHEM LABORATORIES CORPORATION
    Inventors: Paul S. Liu, Sergiy M. Denysenko, Guangfei Huang
  • Publication number: 20180305295
    Abstract: Disclosed is a process for preparing (Z)-endoxifen, comprising (i) recrystallizing an input crystalline solid comprising a mixture of (Z)-endoxifen (1) and (E)-endoxifen (2) from a first solvent to provide a first crystalline solid and a first mother liquor, wherein the first mother liquor has a ratio of (1) to (2) at least 1.3 times greater than the ratio in the input crystalline solid (1) and (2); (ii) recrystallizing a solid produced by concentrating the first mother liquor, or by removal of the first solvent from the first mother liquor, from a second solvent to give a second crystalline solid and a second mother liquor; (iii) optionally recrystallizing the second crystalline solid from the second solvent one to five additional times to give a third crystalline solid; wherein the third crystalline solid has a ratio of (Z)-endoxifen (1) to (E)-endoxifen (2) greater than 20:1.
    Type: Application
    Filed: October 24, 2016
    Publication date: October 25, 2018
    Inventors: Paul S. LIU, Sergiy M. DENYSENKO, Guangfei HUANG
  • Patent number: 7834005
    Abstract: Disclosed are compounds of Formula I wherein X, Y, R1-R7, T1, T2, Z, and p are as described herein; a pharmaceutical composition comprising a compound of Formula I and a carrier; a method of inhibiting growth of a cell, which method comprises administering in an amount effective to inhibit growth a compound of Formula I; a method of treating cancer in a mammal, which method comprises administering in an amount effective to treat cancer a compound of Formula I; a method of treating a viral, parasitic, or bacterial infection of a cell, which method comprises administering in an amount effective to treat a viral, parasitic, or bacterial infection a compound of Formula I; and a method of preparing a compound of Formula I as described herein.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: November 16, 2010
    Assignees: The United States of America as represented by the Department of Health and Human Services, Starks Associates, Inc., Midwest Research Institute, Spirogen, Ltd.
    Inventors: Paul S. Liu, B. Rao Vishnuvajjala, Kenneth M. Snader, David E. Thurston, Philip W. Howard, Luke Y. Hsiao, Gregory Turner
  • Publication number: 20090149449
    Abstract: Disclosed are compounds of Formula I wherein X, Y, R1-R7, T1, T2, Z, and p are as described herein; a pharmaceutical composition comprising a compound of Formula I and a carrier; a method of inhibiting growth of a cell, which method comprises administering in an amount effective to inhibit growth a compound of Formula I; a method of treating cancer in a mammal, which method comprises administering in an amount effective to treat cancer a compound of Formula I; a method of treating a viral, parasitic, or bacterial infection of a cell, which method comprises administering in an amount effective to treat a viral, parasitic, or bacterial infection a compound of Formula I; and a method of preparing a compound of Formula I as described herein.
    Type: Application
    Filed: February 13, 2009
    Publication date: June 11, 2009
    Applicants: The United States of America, as represented by the Secretary, Dept. of Health and Human Service, Starks Associates, Inc., Midwest Research Institute, Spirogen, Ltd.
    Inventors: Paul S. Liu, B. Rao Vishnuvajjala, Kenneth M. Snader, David E. Thurston, Philip W. Howard, Luke Y. Hsiao, Gregory Turner
  • Patent number: 7511032
    Abstract: Disclosed are compounds of Formula (I) wherein X, Y, Ri-R7, T1, T2, Z, and p are as described herein; a pharmaceutical composition comprising a compound of Formula (I) and a carrier; a method of inhibiting growth of a cell, which method comprises administering in an amount effective to inhibit growth a compound of Formula (I); a method of treating cancer in a mammal, which method comprises administering in an amount effective to treat cancer a compound of Formula (I); a method of treating a viral, parasitic, or bacterial infection of a cell, which method comprises administering in an amount effective to treat a viral, parasitic, or bacterial infection a compound of Formula (I); and a method of preparing a compound of Formula (I) as described herein.
    Type: Grant
    Filed: October 22, 2004
    Date of Patent: March 31, 2009
    Assignees: The United States of America as represented by the Secretary, Department of Health and Human Services, Starks Associates, Inc., Midwest Research Institute, Spirogen, Ltd.
    Inventors: Paul S Liu, B. Rao Vishnuvajjala, Kenneth M Snader, David E Thurston, Philip W Howard, Luke Y Hsiao, Gregory Turner
  • Patent number: 7244724
    Abstract: A compound of formula I: or solvate thereof, wherein n is 1 to 10, and M and M? are independently selected from monovalent pharmaceutically acceptable cations, or together represent a divalent pharmaceutically acceptable cation.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: July 17, 2007
    Assignees: United States of America, Represented by the Secretary, Department of Health and Human Services, Spirogen, Ltd.
    Inventors: Paul S. Liu, B. Rao Vishnuvajjala, Kenneth M. Snader, David E. Thurston, Philip Howard, Stephen Gregson
  • Patent number: 6136820
    Abstract: A method for inhibiting the formation of glucose by the administration of castanospermine is described herein. In addition, a new process for the isolation of castanospermine from Castanospermum australe is also described.
    Type: Grant
    Filed: December 5, 1990
    Date of Patent: October 24, 2000
    Assignee: Merrell Pharmaceuticals Inc.
    Inventors: Paul S. Liu, Barry L. Rhinehart
  • Patent number: 5385911
    Abstract: Certain Castanospermine ester derivatives of the formula: ##STR1## wherein R, R.sub.1 and R.sub.2 are each independently hydrogen, C.sub.1-14 alkanoyl, C.sub.1-14 alkenoyl, cyclohexanecarbonyl, C.sub.1-8 alkoxyacetyl, ##STR2## naphthalenecarbonyl optionally substituted by methyl or halogen; phenyl (C.sub.2-6 alkanoyl) wherein the phenyl is optionally substituted by methyl or halogen; cinnamoyl; pyridinecarbonyl optionally substituted by methyl or halogen; dihydropyridine carbonyl optionally substituted by C.sub.1 -C.sub.10 alkyl; thiophenecarbonyl optionally substituted by methyl or halogen; or furancarbonyl optionally substituted by methyl or halogen; Y is hydrogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, halogen, trifluoromethyl, C.sub.1-4 alkylsulfonyl, C.sub.1-4 alkylmercapto, cyano or dimethylamino; Y' is hydrogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, halogen or it is combined with Y to give 3,4-methylenedioxy; Y" is hydrogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy or halogen; with R, R.sub.1 and R.sub.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: January 31, 1995
    Assignee: Merrell Dow Pharmaceuticals Inc.
    Inventors: Sai P. Sunkara, Paul S. Liu, A. Stanley Tyms, Debra L. Taylor
  • Patent number: 5079254
    Abstract: Amide and ester derivatives of 6-amino-octahydro-1,7,8-indolizinetriol are described herein. The compounds are prepared from castanospermine by replacing the appropriate hydroxy function with an amino function while protecting the other hydroxy groups in the meantime. The compounds are useful as hexosaminidase inhibitors.
    Type: Grant
    Filed: June 4, 1990
    Date of Patent: January 7, 1992
    Assignee: Merrell Dow Pharmaceuticals Inc.
    Inventors: Paul S. Liu, Mohinder S. Kang
  • Patent number: 5028614
    Abstract: The present invention describes a group of polyhydroxylated indolizidines and quinolizidines and their esters. These compounds are prepared starting from 2,6-dideoxy-2,6-dideoxy-2,6-imino-1,3,4,5-tetrakis-O- (phenylmethyl)-D-glycero-L-gulo-heptitol or a corresponding N-substituted compound. The compounds are useful in the treatment of diabetes and as .alpha.-glucosidase I inhibitors.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: July 2, 1991
    Assignee: Merrell Dow Pharmaceuticals Inc.
    Inventors: Paul S. Liu, Mohinder S. Kang, Roland S. Rogers, Barry L. Rhinehart
  • Patent number: 5017563
    Abstract: Castanospermine mono- and di-esters and glycosides active as inhibitors of carbohydrate digestive enzymes and useful in treating diabetes are described herein. The compounds are prepared by the reaction of castanospermine with an appropriate acid halide or anhydride or with an appropriate glycosyl halide or glycosyl acetimidate under conditions which would favor the isolation of the mono- and di-esterified and glycosylated products. Various blocking groups, which can be selectively removed under mild conditions, can also be used to favor the formation of certain isomers.
    Type: Grant
    Filed: May 1, 1990
    Date of Patent: May 21, 1991
    Assignee: Merrell Dow Pharmaceuticals Inc.
    Inventors: Paul S. Liu, Barry L. Rhinehart, John K. Daniel
  • Patent number: 5004746
    Abstract: Certain Castanospermine ester derivatives are disclosed to be effective in treating retroviral infections including HIV infections and are thus useful in the treatment of AIDS and ARC.
    Type: Grant
    Filed: September 29, 1987
    Date of Patent: April 2, 1991
    Assignee: Merrell Dow Pharmaceuticals Inc.
    Inventors: Paul S. Liu, Sai P. Sunkara, Terry L. Bowlin
  • Patent number: 4952585
    Abstract: A method for the inhibition of tumor metastases is described herein. The method makes use of the administration of certain castanospermine esters or their pharmaceutically acceptable salts.
    Type: Grant
    Filed: December 15, 1988
    Date of Patent: August 28, 1990
    Assignee: Merrell Dow Pharmaceuticals Inc.
    Inventors: Sai P. Sunkara, Paul S. Liu
  • Patent number: 4880917
    Abstract: A procedure for the mild conversion of a carbonitrile to the corresponding carboxylic acid by first using trifluoroacetic acid in the presence of a catalytic amount of mercuric ion followed by oxidative hydrolysis with dinitrogen tetroxide is described herein. The use of this procedure in the preparation of 1,3,4,5-tetra-O-benzoyl-2,6-dideoxy-2,6-imino-D-glycero-L-gulo-heptitol hydrochloride is also described here.
    Type: Grant
    Filed: July 1, 1988
    Date of Patent: November 14, 1989
    Assignee: Merrell Dow Pharmaceuticals Inc.
    Inventors: Peter B. Anzeveno, John K. Daniel, Laura J. Creemer, Paul S. Liu
  • Patent number: 4792558
    Abstract: A method for the inhibition of tumor metastases is described herein. The method makes use of the administration of castanospermine.
    Type: Grant
    Filed: May 29, 1987
    Date of Patent: December 20, 1988
    Assignee: Merrell Dow Pharmaceuticals Inc.
    Inventors: Sai P. Sunkara, Barry L. Rhinehart, Paul S. Liu
  • Patent number: 4634765
    Abstract: Homonojirimycin glycosides active as inhibitors of carbohydrate digestive enzymes are described herein. The compounds are prepared by the reaction of an appropriately protected homonojirimycin with a protected glycosyl halide followed by removal of the protecting groups.
    Type: Grant
    Filed: December 18, 1984
    Date of Patent: January 6, 1987
    Assignee: Merrell Dow Pharmaceuticals Inc.
    Inventor: Paul S. Liu
  • Patent number: 4275057
    Abstract: Seven-membered heterocyclic nucleosides used to inhibit the deamination enzyme responsible for the inactivation of arabinosylcytosine (ara--C). Preferred nucleosides containing a seven-member aglycone are as follows: ##STR1## Preferred aglycones are as follows: ##STR2## Active components utilized against pyrimidine deaminases from mammalian tissues (mouse kidney and human liver) showed optimum advantage when compared with tetrahydrouridine (THU).
    Type: Grant
    Filed: January 28, 1980
    Date of Patent: June 23, 1981
    Assignee: The United States of America as represented by the Department of Health, Education and Welfare
    Inventors: Victor E. Marquez, Paul S. Liu, John S. Driscoll